Operating at the LHC, the highest-energy particle collider ever
constructed ATLAS is exploring the energy frontier of particle physics.
My research on ATLAS focuses on searching for
new particles that are long-lived, which are predicted in many extensions
to the standard model. Particles that decay
milimiters to tens of centimeters from their production point
are detected by the very precise ATLAS tracker. My students, postdocs
and I participated in the
first LHC publication of this kind of search,
interpreted in the context of supersymmetric models.
In the
2nd,
3rd, and
4th
papers, we added data, expanded the search signature, and
improved the analysis. We are in the process of applying our
experience to the problem of right-handed neutrinos and other
low-mass, long-lived particles. The sensitivity of these
background-free searches will grow linearly with the LHC luminosity,
which will grow almost 100-fold relative to the last published
analysis. This poses a great opportunity, as well as interesting
technical challenges as we expand the search parameter space.

Belle II builds on the success of the previous-generation experiments,
BaBar
and Belle, which greatly improved
our understanding of heavy-flavor physics and CP violation, leading to
the 2008
Nobel Prize in Physics. Belle II collects data from
electron-positron collisions produced by SuperKEKB, the world's
highest-luminosity collider. The 40-fold increase in the collected
data set and use of an improved detector help probe flavor-changing
new physics at mass scales much higher than those of LHC.
I am particularly interested in employing new methods that take advantage of
Belle II's high spatial resolution to perform studies that have never
been done before. The current focus of my group in this area is B-meson
decays to final states containing tau leptons, where tensions with the
standard-model predictions have been found.

Phenomenology.

Although I am not a theorist, I occasionally collaborate with theorists
on phenomenology papers. Here is a list.